... well you should!This is what I faced when I opened the SC-55 I received today:

A leaking CR-2032 battery! Fortunately the plastic holder prevented the acid from reaching the pcb... Might worth to check your units, it would be a shame if they developed faults because of the battery. The situation is not as serious as the NiCad batteries that have killed countless mobos/amigas/etc , but still! Better safe than sorry

Good point, thanks for mentioning. Thought about this as well. These batteries can be 20+ years old now so they can definitely cause problems. Sucks that opening the SC-88 is a bit more complicated due to the multiple boards and PSU inside but I should take a look at opening mine

Do the other caps also have these strange crescent-shaped white markings on the PCB around their bases? To me it looks like they deliberately applied some glue in order to stop vibrations or something like that. I could be wrong though...

this is just glue to hold the cap into place, no idea why (maybe to solder underneath?) but it's a know tactic on older stuff... if it was cap asid then you would see corrosion and white fungus-like damage similar to the battery image I posted above

5u3 wrote:Do the other caps also have these strange crescent-shaped white markings on the PCB around their bases? To me it looks like they deliberately applied some glue in order to stop vibrations or something like that. I could be wrong though...

glue eating traces? never seen that... maybe the cap leaked and caused this...

No, there is indeed a glue that'll turn corrosive. I'm not sure exactly what sort of substance it is, but I've seen it a couple times myself in some '80s stereo equipment. And I know it wasn't a leaky cap, because it happened in some places that weren't near a cap.

There's also sort of glue that eventually carbonizes and goes conductive after prolonged exposure to heat. I've seen a fair number of PC PSUs that have failed because of that... and I imagine it made for quite a light show in cases where it shorted stuff on the primary side.